id:A054920 - OEIS Search Results

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Number of connected unlabeled reflexive relations with n nodes such that complement is also connected.

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2, 4, 68, 2592, 278796, 95720106, 111891292036, 457846756500066, 6664787020904248568, 349363873490889302878250, 66602024342830108271942323060, 46557190064705399729526041154647820 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.`
	FORMULA	`2*A054919(n)-A000595(n).`
	CROSSREFS	`Sequence in context: A118993 A100603 A018364 this_sequence A062061 A066974 A018373` `Adjacent sequences: A054917 A054918 A054919 this_sequence A054921 A054922 A054923`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), May 24 2000`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 17 2000`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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